On 10/21/2014 5:00 PM, [email protected] wrote: >> > never afraid to embarrass myself in public, after a discussion >> > with a colleague, i want to make sure i understand what it is that >> > allows a router to advertise itself as something like "3G/4G/LTE" >> > compatible. >> > >> > i want to purchase an openwrt-supported router that lets me play >> > with both: >> > >> > * a raw USB GPS receiver * a 3G/4G broadband modem >> > >> > my colleague pointed out that, when looking at advertising >> > material, one needed to look for the "3G/4G" label somewhere. but i >> > had assumed that, if i'm going to configure, build and install >> > openwrt, i have control over all the drivers/modules i'm going to >> > install, so i can simply add whatever software features i'm going >> > to need. >> > >> > as in, for GPS, as long as a router has a USB port, i can build >> > openwrt so that it can talk to a USB GPS receiver i just bought: > if your usb devices is supported by openwrt i think you can do so. > >> > >> > http://www.canadagps.com/BU353-S4.html >> > >> > the same for a 3G/4G broadband modem -- all i technically need is >> > a USB port, and i can build and install openwrt with all of the >> > functionality i need so i can plug in and use, say, a sierra >> > wireless modem, no? >> > >> > one exception -- a board i'm playing with has a PCIe slot, so >> > obviously, that's another option for a broadband modem such as, >> > say, >> > >> > http://www.ebay.ca/itm/Sierra-MC7700-Mini-PCI-e-3G-HSPA-LTE-100MBP-Wireless-WWAN-WLAN-Card-GPS-Unlocked-/111045288092 >> > >> > but other than that, as long as the router i select has a USB >> > port, is there anything else *physically* about a router that would >> > make it incapable of what i want to do? am i making sense? > there are some tp-link models which claim to support g3/g4 and yes the > only reason why they say so is their usb port which can be used to > plug in a usb-g3/g4-modem, as you thought. > > i heared aslo of some wireless routes which have also a sim-card-slot > and a build-in modem, but some of these models also are supported by > openwrt... so yeah i think in your discussion you have a valid point.
In addition to those requirements, the USB port should supply enough power to bring the 3G/4G dongle to live. With limited or no power, random dongle disconnects may occurs and make the 3G/4G connection unstable or doesn't work at all. There is a recommendation to use an external USB power supply to feed those power-hungry 3G/4G dongles, but I think it's a good idea since it may cause a reverse electric shock to the board. I think is a good post about 3G/4G dongle power consumption measurement as reference. <http://grunenberger.net/2014/02/24/4g-3g-2g-power-consumption/> _______________________________________________ openwrt-users mailing list [email protected] https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users
